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640
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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660
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4 * Copyright (C) Nginx, Inc.
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640
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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14 ngx_uint_t max_cached;
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15 ngx_uint_t single; /* unsigned:1 */
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16
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17 ngx_queue_t cache;
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18 ngx_queue_t free;
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19
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20 ngx_http_upstream_init_pt original_init_upstream;
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21 ngx_http_upstream_init_peer_pt original_init_peer;
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22
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23 } ngx_http_upstream_keepalive_srv_conf_t;
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24
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25
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26 typedef struct {
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27 ngx_http_upstream_keepalive_srv_conf_t *conf;
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28
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29 ngx_http_upstream_t *upstream;
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30
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31 void *data;
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32
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33 ngx_event_get_peer_pt original_get_peer;
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34 ngx_event_free_peer_pt original_free_peer;
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35
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36 #if (NGX_HTTP_SSL)
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37 ngx_event_set_peer_session_pt original_set_session;
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38 ngx_event_save_peer_session_pt original_save_session;
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39 #endif
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40
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41 ngx_uint_t failed; /* unsigned:1 */
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42
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43 } ngx_http_upstream_keepalive_peer_data_t;
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44
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45
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46 typedef struct {
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47 ngx_http_upstream_keepalive_srv_conf_t *conf;
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48
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49 ngx_queue_t queue;
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50 ngx_connection_t *connection;
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51
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52 socklen_t socklen;
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53 u_char sockaddr[NGX_SOCKADDRLEN];
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54
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55 } ngx_http_upstream_keepalive_cache_t;
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56
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57
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58 static ngx_int_t ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r,
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59 ngx_http_upstream_srv_conf_t *us);
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60 static ngx_int_t ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc,
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61 void *data);
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62 static void ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc,
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63 void *data, ngx_uint_t state);
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64
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65 static void ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev);
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66 static void ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev);
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67 static void ngx_http_upstream_keepalive_close(ngx_connection_t *c);
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68
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69
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70 #if (NGX_HTTP_SSL)
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71 static ngx_int_t ngx_http_upstream_keepalive_set_session(
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72 ngx_peer_connection_t *pc, void *data);
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73 static void ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc,
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74 void *data);
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75 #endif
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76
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77 static void *ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf);
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78 static char *ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd,
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79 void *conf);
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80
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81
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82 static ngx_command_t ngx_http_upstream_keepalive_commands[] = {
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83
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84 { ngx_string("keepalive"),
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85 NGX_HTTP_UPS_CONF|NGX_CONF_TAKE12,
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86 ngx_http_upstream_keepalive,
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87 0,
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88 0,
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89 NULL },
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90
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91 ngx_null_command
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92 };
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93
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94
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95 static ngx_http_module_t ngx_http_upstream_keepalive_module_ctx = {
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96 NULL, /* preconfiguration */
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97 NULL, /* postconfiguration */
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98
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99 NULL, /* create main configuration */
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100 NULL, /* init main configuration */
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101
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102 ngx_http_upstream_keepalive_create_conf, /* create server configuration */
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103 NULL, /* merge server configuration */
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104
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105 NULL, /* create location configuration */
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106 NULL /* merge location configuration */
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107 };
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108
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109
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110 ngx_module_t ngx_http_upstream_keepalive_module = {
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111 NGX_MODULE_V1,
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112 &ngx_http_upstream_keepalive_module_ctx, /* module context */
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113 ngx_http_upstream_keepalive_commands, /* module directives */
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114 NGX_HTTP_MODULE, /* module type */
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115 NULL, /* init master */
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116 NULL, /* init module */
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117 NULL, /* init process */
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118 NULL, /* init thread */
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119 NULL, /* exit thread */
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120 NULL, /* exit process */
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121 NULL, /* exit master */
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122 NGX_MODULE_V1_PADDING
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123 };
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124
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125
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126 static ngx_int_t
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127 ngx_http_upstream_init_keepalive(ngx_conf_t *cf,
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128 ngx_http_upstream_srv_conf_t *us)
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129 {
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130 ngx_uint_t i;
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131 ngx_http_upstream_keepalive_srv_conf_t *kcf;
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132 ngx_http_upstream_keepalive_cache_t *cached;
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133
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134 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0,
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135 "init keepalive");
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136
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137 kcf = ngx_http_conf_upstream_srv_conf(us,
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138 ngx_http_upstream_keepalive_module);
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139
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140 if (kcf->original_init_upstream(cf, us) != NGX_OK) {
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141 return NGX_ERROR;
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142 }
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143
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144 kcf->original_init_peer = us->peer.init;
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145
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146 us->peer.init = ngx_http_upstream_init_keepalive_peer;
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147
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148 /* allocate cache items and add to free queue */
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149
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150 cached = ngx_pcalloc(cf->pool,
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151 sizeof(ngx_http_upstream_keepalive_cache_t) * kcf->max_cached);
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152 if (cached == NULL) {
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153 return NGX_ERROR;
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154 }
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155
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156 ngx_queue_init(&kcf->cache);
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157 ngx_queue_init(&kcf->free);
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158
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159 for (i = 0; i < kcf->max_cached; i++) {
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160 ngx_queue_insert_head(&kcf->free, &cached[i].queue);
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161 cached[i].conf = kcf;
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162 }
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163
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164 return NGX_OK;
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165 }
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166
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167
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168 static ngx_int_t
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169 ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r,
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170 ngx_http_upstream_srv_conf_t *us)
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171 {
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172 ngx_http_upstream_keepalive_peer_data_t *kp;
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173 ngx_http_upstream_keepalive_srv_conf_t *kcf;
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174
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175 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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176 "init keepalive peer");
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177
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178 kcf = ngx_http_conf_upstream_srv_conf(us,
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179 ngx_http_upstream_keepalive_module);
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180
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181 kp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_keepalive_peer_data_t));
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182 if (kp == NULL) {
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183 return NGX_ERROR;
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184 }
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185
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186 if (kcf->original_init_peer(r, us) != NGX_OK) {
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187 return NGX_ERROR;
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188 }
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189
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190 kp->conf = kcf;
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191 kp->upstream = r->upstream;
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192 kp->data = r->upstream->peer.data;
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193 kp->original_get_peer = r->upstream->peer.get;
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194 kp->original_free_peer = r->upstream->peer.free;
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195
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196 r->upstream->peer.data = kp;
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197 r->upstream->peer.get = ngx_http_upstream_get_keepalive_peer;
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198 r->upstream->peer.free = ngx_http_upstream_free_keepalive_peer;
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199
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200 #if (NGX_HTTP_SSL)
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201 kp->original_set_session = r->upstream->peer.set_session;
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202 kp->original_save_session = r->upstream->peer.save_session;
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203 r->upstream->peer.set_session = ngx_http_upstream_keepalive_set_session;
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204 r->upstream->peer.save_session = ngx_http_upstream_keepalive_save_session;
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205 #endif
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206
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207 return NGX_OK;
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208 }
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209
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210
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211 static ngx_int_t
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212 ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data)
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213 {
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214 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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215 ngx_http_upstream_keepalive_cache_t *item;
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216
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217 ngx_int_t rc;
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218 ngx_queue_t *q, *cache;
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219 ngx_connection_t *c;
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220
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221 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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222 "get keepalive peer");
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223
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224 kp->failed = 0;
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225
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226 /* single pool of cached connections */
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227
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228 if (kp->conf->single && !ngx_queue_empty(&kp->conf->cache)) {
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229
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230 q = ngx_queue_head(&kp->conf->cache);
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231
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232 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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233 c = item->connection;
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234
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235 ngx_queue_remove(q);
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236 ngx_queue_insert_head(&kp->conf->free, q);
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237
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238 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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239 "get keepalive peer: using connection %p", c);
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240
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241 c->idle = 0;
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242 c->log = pc->log;
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243 c->read->log = pc->log;
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244 c->write->log = pc->log;
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245 c->pool->log = pc->log;
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246
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247 pc->connection = c;
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248 pc->cached = 1;
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249
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250 return NGX_DONE;
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251 }
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252
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253 rc = kp->original_get_peer(pc, kp->data);
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254
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255 if (kp->conf->single || rc != NGX_OK) {
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256 return rc;
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257 }
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258
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259 /* search cache for suitable connection */
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260
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261 cache = &kp->conf->cache;
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262
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263 for (q = ngx_queue_head(cache);
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264 q != ngx_queue_sentinel(cache);
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265 q = ngx_queue_next(q))
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266 {
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267 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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268 c = item->connection;
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269
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270 if (ngx_memn2cmp((u_char *) &item->sockaddr, (u_char *) pc->sockaddr,
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271 item->socklen, pc->socklen)
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272 == 0)
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273 {
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274 ngx_queue_remove(q);
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275 ngx_queue_insert_head(&kp->conf->free, q);
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276
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277 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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278 "get keepalive peer: using connection %p", c);
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279
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280 c->idle = 0;
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281 c->log = pc->log;
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282 c->read->log = pc->log;
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283 c->write->log = pc->log;
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284 c->pool->log = pc->log;
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285
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286 pc->connection = c;
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287 pc->cached = 1;
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288
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289 return NGX_DONE;
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290 }
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291 }
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292
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293 return NGX_OK;
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294 }
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295
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296
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297 static void
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298 ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data,
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299 ngx_uint_t state)
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300 {
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301 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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302 ngx_http_upstream_keepalive_cache_t *item;
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303
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304 ngx_queue_t *q;
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305 ngx_connection_t *c;
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306 ngx_http_upstream_t *u;
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307
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308 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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309 "free keepalive peer");
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310
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311 /* remember failed state - peer.free() may be called more than once */
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312
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313 if (state & NGX_PEER_FAILED) {
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314 kp->failed = 1;
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315 }
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316
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317 /* cache valid connections */
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318
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319 u = kp->upstream;
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320 c = pc->connection;
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321
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322 if (kp->failed
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323 || c == NULL
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324 || c->read->eof
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325 || c->read->error
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326 || c->read->timedout
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327 || c->write->error
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328 || c->write->timedout)
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329 {
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330 goto invalid;
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331 }
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332
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333 if (!u->keepalive) {
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334 goto invalid;
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335 }
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336
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337 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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338 goto invalid;
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339 }
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340
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341 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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342 "free keepalive peer: saving connection %p", c);
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343
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344 if (ngx_queue_empty(&kp->conf->free)) {
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345
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346 q = ngx_queue_last(&kp->conf->cache);
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347 ngx_queue_remove(q);
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348
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349 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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350
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351 ngx_http_upstream_keepalive_close(item->connection);
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352
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353 } else {
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354 q = ngx_queue_head(&kp->conf->free);
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355 ngx_queue_remove(q);
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356
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357 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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358 }
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359
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360 item->connection = c;
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361 ngx_queue_insert_head(&kp->conf->cache, q);
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362
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363 pc->connection = NULL;
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364
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365 if (c->read->timer_set) {
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366 ngx_del_timer(c->read);
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367 }
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368 if (c->write->timer_set) {
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369 ngx_del_timer(c->write);
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370 }
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371
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372 c->write->handler = ngx_http_upstream_keepalive_dummy_handler;
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373 c->read->handler = ngx_http_upstream_keepalive_close_handler;
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374
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375 c->data = item;
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376 c->idle = 1;
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377 c->log = ngx_cycle->log;
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378 c->read->log = ngx_cycle->log;
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379 c->write->log = ngx_cycle->log;
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380 c->pool->log = ngx_cycle->log;
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381
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382 item->socklen = pc->socklen;
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383 ngx_memcpy(&item->sockaddr, pc->sockaddr, pc->socklen);
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384
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385 if (c->read->ready) {
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386 ngx_http_upstream_keepalive_close_handler(c->read);
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387 }
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388
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389 invalid:
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390
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391 kp->original_free_peer(pc, kp->data, state);
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392 }
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393
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394
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395 static void
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396 ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev)
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397 {
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398 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
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399 "keepalive dummy handler");
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400 }
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401
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402
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403 static void
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404 ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev)
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405 {
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406 ngx_http_upstream_keepalive_srv_conf_t *conf;
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407 ngx_http_upstream_keepalive_cache_t *item;
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408
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409 int n;
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410 char buf[1];
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411 ngx_connection_t *c;
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412
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413 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
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414 "keepalive close handler");
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415
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416 c = ev->data;
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417
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418 if (c->close) {
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419 goto close;
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420 }
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421
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422 n = recv(c->fd, buf, 1, MSG_PEEK);
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423
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424 if (n == -1 && ngx_socket_errno == NGX_EAGAIN) {
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425 /* stale event */
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426
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427 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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428 goto close;
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429 }
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430
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431 return;
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432 }
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433
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434 close:
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435
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436 item = c->data;
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437 conf = item->conf;
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438
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439 ngx_http_upstream_keepalive_close(c);
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440
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441 ngx_queue_remove(&item->queue);
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442 ngx_queue_insert_head(&conf->free, &item->queue);
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443 }
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444
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445
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446 static void
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447 ngx_http_upstream_keepalive_close(ngx_connection_t *c)
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448 {
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449
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450 #if (NGX_HTTP_SSL)
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451
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452 if (c->ssl) {
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453 c->ssl->no_wait_shutdown = 1;
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454 c->ssl->no_send_shutdown = 1;
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455
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456 if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
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457 c->ssl->handler = ngx_http_upstream_keepalive_close;
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458 return;
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459 }
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460 }
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461
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462 #endif
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463
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464 ngx_destroy_pool(c->pool);
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465 ngx_close_connection(c);
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466 }
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467
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468
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469 #if (NGX_HTTP_SSL)
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470
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471 static ngx_int_t
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472 ngx_http_upstream_keepalive_set_session(ngx_peer_connection_t *pc, void *data)
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473 {
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474 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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475
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476 return kp->original_set_session(pc, kp->data);
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477 }
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478
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479
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480 static void
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481 ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc, void *data)
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482 {
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483 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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484
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485 kp->original_save_session(pc, kp->data);
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486 return;
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487 }
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488
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489 #endif
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490
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491
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492 static void *
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493 ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf)
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494 {
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495 ngx_http_upstream_keepalive_srv_conf_t *conf;
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496
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497 conf = ngx_pcalloc(cf->pool,
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498 sizeof(ngx_http_upstream_keepalive_srv_conf_t));
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499 if (conf == NULL) {
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500 return NULL;
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501 }
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502
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503 /*
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504 * set by ngx_pcalloc():
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505 *
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506 * conf->original_init_upstream = NULL;
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507 * conf->original_init_peer = NULL;
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508 */
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509
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510 conf->max_cached = 1;
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511
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512 return conf;
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513 }
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514
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515
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516 static char *
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517 ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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518 {
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519 ngx_http_upstream_srv_conf_t *uscf;
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520 ngx_http_upstream_keepalive_srv_conf_t *kcf;
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521
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522 ngx_int_t n;
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523 ngx_str_t *value;
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524 ngx_uint_t i;
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525
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526 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
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527
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528 kcf = ngx_http_conf_upstream_srv_conf(uscf,
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529 ngx_http_upstream_keepalive_module);
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530
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531 kcf->original_init_upstream = uscf->peer.init_upstream
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532 ? uscf->peer.init_upstream
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533 : ngx_http_upstream_init_round_robin;
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534
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535 uscf->peer.init_upstream = ngx_http_upstream_init_keepalive;
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536
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537 /* read options */
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538
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539 value = cf->args->elts;
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540
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541 n = ngx_atoi(value[1].data, value[1].len);
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542
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543 if (n == NGX_ERROR || n == 0) {
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544 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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545 "invalid value \"%V\" in \"%V\" directive",
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546 &value[1], &cmd->name);
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547 return NGX_CONF_ERROR;
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548 }
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549
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550 kcf->max_cached = n;
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551
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552 for (i = 2; i < cf->args->nelts; i++) {
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553
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554 if (ngx_strcmp(value[i].data, "single") == 0) {
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555 kcf->single = 1;
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556 continue;
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557 }
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558
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559 goto invalid;
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560 }
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561
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562 return NGX_CONF_OK;
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563
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564 invalid:
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565
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566 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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567 "invalid parameter \"%V\"", &value[i]);
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568
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569 return NGX_CONF_ERROR;
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570 }
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